| :func:`~unittest.TestCase.assertRaises`, | |
| :func:`~unittest.TestCase.assertRaisesRegex`, | |
| :func:`~unittest.TestCase.assertWarns` and | |
| :func:`~unittest.TestCase.assertWarnsRegex` no longer success if the passed | |
| callable is None. They no longer ignore unknown keyword arguments in the | |
| context manager mode. A DeprecationWarning was raised in these cases | |
| since Python 3.5. |